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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ac1d636518bb10f0e1f95bb6035d485979cd02e288f4ce1f78b966462a15c5' 
  AND token = '8XcQlvQ2dxjQnjyop0Ft3B5i96CDfo+79VJhwQbshcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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