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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9197efd1e68d11d1753d776403c3666965528126b2f48263622037d6587c6165' 
  AND token = 'BmrDPDKQ6NWcmYcUn085jbvnf3oQ8+Pow8SG2au3rOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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