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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc7b91a23be4007664bbad15437b2ca84635c19cf95fa0054cc000b8e25b5d9' 
  AND token = 'zVFTNXxy+4BG2Em+8n8DriVp7r4ivt0s7fvocmFy60M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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