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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd59c054e1e8737d397164715ff37472639fdfac610808ce420e1a326cafce5f' 
  AND token = 'PySrJ9z/G1kRhYN40jtYGC79Gy8jiO0q/V+zyevum2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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