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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41c4d558e50864221db66c62b2d55bbd1a0f5f990a20107c2faca0c9bfa89b01' 
  AND token = 'l9pKN9p9al201LX7zybE5Egvwnbl5Hfl/s8LXPHOzkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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