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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '965458b33c748890f3f4d2c0380c1c39c1b0de443af20563713be92ff820fcfe' 
  AND token = 'cPdK0hSHv/FBf64rHJNX+23TFvOa0Ze96GkuAG17Nzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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