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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '233ba169be02b1edea7f311642b57b00643fd559d9604496978599dfd4bcd66a' 
  AND token = '6v+XXxVF2LTxtx2sqygjcYT0Ee6+YadBxYvxoq/w7ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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