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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61f26c9e60a23a9923d34de89b2624642de65ce6e80f6f1256191520866e01b' 
  AND token = 'm+jExG4ZJTR4PxHfgeSfaKKyvsAij+TT0UoZCMC3GVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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