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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e12558583b2359ce984060c7f91816e897f17bbf77f5c0c970d27200d9066562' 
  AND token = '8vV0O3nxwEJc5CMrMSFcTLt0VsGe0ONheDUODeA2Ivo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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