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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69c348ef88e68854e84095cbc1f1d232aa46419c9e5ac72795a9d443c36e754' 
  AND token = 'GBAdm210L19eb9HCJyMVtOaIak9zDWB2gR+3YBIJpKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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