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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9341f5746d10e703327defd2b0a0c78802d22609a201b643ee8789b0b348af' 
  AND token = 'lcEpcVjIcu1dGWTUB/7CxS7RDiqPss0YsfdC6YQ++2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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