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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '120669279aeec9cb309fa4f5bf72fb1b547f3953a95b630715da66a2230e0e3b' 
  AND token = 's4ABlnP3ygJSKbmYGUgerPYZ1UGk963QU/KYHtKdiRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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