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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f41e8c4a1170bf293e45d5ff27c4c5855552b3e78cf2b1b1dfd558636ff740d' 
  AND token = 'pzoE9iMQKSZoPVBL5kT1PSoE8yfZ0UmiFhcY/IVP4ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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