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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c9fe8f54c3d5217441860921afe52b9ebad9fe528541659123ef33dd4f14f5' 
  AND token = 'FRsmu4kqNH0mc5wxi4svxH8epljXeJb3kJ1EWLF/aZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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