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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2dfe2dbf990a52c3900a98e31ccd053ff2fcedb270b02e8425c11be898f5d0a' 
  AND token = 'HlgJ1erVOGBfE6Y9QKaVp4XW3N/j0cgLf7kpQeqjL1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}