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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ce1b810710ea268270fa860ae9f342b71ed94db07021dfd93e9f615ba377ff' 
  AND token = 'jUbCAPt2AmMXyEKHKc/tG+q2iLWNKfE4M3/q2u9/cEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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