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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35140801c74877f4a80e0973fefa1c30445c6b21f0f099a5efbd2d8498cb6c3' 
  AND token = 'aJG61FMZ95grNSjECt4YcHnp/HD49ODufmj32VMicSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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