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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c42cf6b4344764cb3feb4252a6c0ec46d1a84253931c0133281040ff006a36' 
  AND token = 'yIh5yLdPAlh4nyfz7ulwDXMQZfl7gF+iqoZPL7riRBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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