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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2569db0210bf9b5267c95581c2d3f1f112c72087adba750a0fe864431b2c723' 
  AND token = 'M1qnxj41lJ3Irkimsu9/2JAFwSY44gtjbv0Zg7lUha4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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