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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f1e93d9d98e70655360ec16d2097a9603d43d99738872d233cd7e30b4a47f3' 
  AND token = '+kwoKGLeSfdDF1xu1yZWiryIOUv6C43vJG5mS+gzBJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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