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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2653006ed69655a447b05bc782cc2742aef13ba7ab2d3df5860e80fd2d143e' 
  AND token = '3MR8COYF4gxPdX501GRdo91Fildw9X/VxLKOmZZTNl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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