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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eafab9c4430c5dbcd5b373bf8686798592d3c26d6f2b8d7734057c1e12936d78' 
  AND token = 'sOUeiojs5c3Uz5Rs12NCnMXIZRnJEAO84U5R4WK2CXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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