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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7196646a71b0b5b29ccbe60775223a1b50a059c1229be63eb32a5608404bfaa' 
  AND token = 'SfxRj4NQ+QgAN/KHnWHgxSeV9Ay1rjTCNWSff2+tkGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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