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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a706d2bd737b62425126cdd68e08a4a3c3687326fddf68fc06be1e2fec413d' 
  AND token = '/CVYdlR2yUeP2XmvR3XCsn1Ch56lhF6QW1/R1jZ8IGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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