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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7007607f392f32e1c33668dbcd5bb2c0c8771a1e076a084bf11c9cb4ff2ea5d' 
  AND token = '/NdQrvYBVBXXSyweNlYQ/3MrpA/d4rqgO+JvwkPcscs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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