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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666088afb79ef43a66b3e34c527d25adc4033b2c4713821a62e3f3cbe7c41674' 
  AND token = 'cleCchW+F4xF5HZXmNEsppBWyewVubuHS44v3bYN3as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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