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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a42d24af8905796d39b05ec539398870af6f7df394143e8f7589b89c5e0042' 
  AND token = 'pM6pgc2wl1gn3a3lqCUBJJQhiM0LIBwRtEIDFsy1yTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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