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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07803dda7dd10aa5e4a2791d480d90e033a0c1ec2f5022fcf02432a0f9eca1ef' 
  AND token = 'HZBT2yQ1VksOSMWFN4ydVrEt8h9dVPsit2o2NC1gQqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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