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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ba880550b58e4c99e2675bbd6b7424e8f521a16e7b18d0948a435c5d1b510c' 
  AND token = 'Ae/9Lrk+sm7+Ft64BjfvosrOCs2pX6n6KsNmN+rA7Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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