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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57af134cfdcb57576f33a837b5f81d3c34b63652db6ab51d79bf907a32661944' 
  AND token = 'vNVj2LzPxbnw73REjivewVZ/p+Xd4M79HVemfWElia0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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