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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1adee1886ddec2b46fc6bc920c92020c4ab8662b7d727f0f9e5e0cd5b5dcb5c' 
  AND token = '6hoHhDFMNF3HuO1/C7yRYz/I3kYmNWk/l5w3IA3XMZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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