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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a0c418502b6c686bdcb84205347966b76586f21b56e3315bb82932eae12c04' 
  AND token = 'GC+6t4VkRtQqFK6MeFfi+Z8n1WdXOQVDD9UsxaRftIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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