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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e93819eb0bb93a7990a5a14af503b4ac6338c826b20407da218237f6e60e4d' 
  AND token = '6MMvNv8WmVliY8Xyv5edEIeHV3LzgXnGngsfQzuSUgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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