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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fcf2fa5ded12afa1148a6b95153b60d1e2f2ddaf4a3ad4ae8208408bf95ec0' 
  AND token = 'HY9vvGw9a70ohoiepq4s5dgto1HL6AvzvmkLxRC3HQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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