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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50bc5132713a630e62c829e4d99b53d568b7f1af035a1e56114a54e104b156ea' 
  AND token = 'yW1w4NSl1E5c4CEVvYSxZ1jsaSXihrS/1J8Z/q14Nxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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