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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee66195c2feb563b2b7b86834c2f6e22bf0516f69c7ea283a4bc06d456259e4' 
  AND token = '5QxemrNTuajatFOCzNS8orPUEn36/AEAcz1Yl/F6iNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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