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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ae742eeddf4be9ed36c926cddb4c81f3c08b91a81ba9a0f75aa0d7d9536f74' 
  AND token = 'XsnMCxpR5tXM4o7wFYiKUHlFgevXPdwfz1zFv8dGJ+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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