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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f2e56ed9d3ffc42a3e91f2159b0e60be71f78c40f14af7a55f9ef68d91acd1' 
  AND token = 'knIgSTGUODKiNC3XUKAc+dVhjCV0uH4SIML5MUxSwGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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