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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4703b5c976141531dca0e938c93587711626d907c5b649ed590d8dc4f7c7c5b0' 
  AND token = '5MQ8chOCaqdvDXV1DI36hbTK69EqBTTsbvrcCMfZTBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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