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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936fb9fd65c6037682e0c7e0b0b428f51f09367c2e90a0890176e6096922a41b' 
  AND token = 'EbJavcw4h1hhmAJcMWnCIY9jYWQ7l3aL9yzifm/UL04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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