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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7550806a38b12f094de00cbcce529e9bde0329be72fff262d3aff833c21d42d6' 
  AND token = 'MJAwb5mo7IsiPXUw14xRcFZRu5WGk/hfY8khEoR4ezU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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