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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ae566d7c042b003f615ebee76828067d9372c8c0fd16b15529965e0a5a9835' 
  AND token = 'uJ4G3xyOm6NijRJpx8ljMT6zQYNETd0GG/MkrrMn3Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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