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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e5a7accfcd417e44081cb7e3750bb365c231bd177cb78984988a58bcada3a2' 
  AND token = '5pU3R4R+4KR8LgDXZqasAdmS3YkT2Wqi7sNtPVOoYBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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