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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f34e3f8034008b8e7abdc76340a33d2ae0a98f6801daa6ad13136280673f704' 
  AND token = 'lZxcn8Ps2EgJh+Pg+hkabJlVkCqS9VXD7rqtTeNUx/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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