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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98e0dddad5ff495109ab24f6a6ef819427805bbbe2c0b0797757e502d095625' 
  AND token = '5u1BiR26peU4xtpxe0jHXn+hQUOdq2wcz2Q58LtG1sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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