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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e345c14818b0a0c960cf1d0b1161b0c4058530b62da83daa25f2f0e1e29f932' 
  AND token = 'fIuVzss+buhKrfFpRuWlsDtoHCk/oTQ0cKr+J76RJJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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