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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d12ab51c88ee5121ea7d8b6badb55c2a9de17d381e532832c60feaf5624f3c' 
  AND token = 'a0PXi/oNS+cyue3e9vLvgcORzs9Z1cVjWQ8u5KpsviM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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