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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc7ae28e2dc08a1464768b3d862a09ad1a3a11fdd0bb3be4bf5fb26b23766e3' 
  AND token = 'v5GlmaOwk4z6KSUNDEbbnGJ+rkfszaTlUqmvvf6XfF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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