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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620ab24e497d2e06c46e7a0749d977d4bd2729041f9ed571e73dd8310f4d09bc' 
  AND token = 'zyLzVPxLLyM64RPECAiBp4Z0vSLaE89cpwTnP+IG9J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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