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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c760e1ae8fb16fd2bcc266f6830c1aa6fd34c9dea6c61d49d333dfdb6427745' 
  AND token = 'PAStq+eefAB+h7PZsmPYmrzmAOmjSyXpudC14Sd8XZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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