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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34976e6f63bc96a3de0213996b2fcba2e9c0e310cc92eea04eb900d55a38a1d7' 
  AND token = '3nGq7ppn2Emn69XENAPV3zr8eVYsCytdu3Hf7ifDq2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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