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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08415e62b45ab8667a3b539fb5a9c26cc308195a0544f72bc6305b4a6e110ee4' 
  AND token = 'DASA4fDojH/xRm85Pr66so0sEvJGZyD2V0Dva0OcuI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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