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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70208d603dcb814e5e6336919b1b4f468c0acdf57a6699259bc14fac41ed100a' 
  AND token = 'jFPDv5Sy0GKr7RlScPVhy1+teajx+Ye80MPOYUsUJGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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