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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12967cde444d095f4a62d8bbbb8e8da2a8fac778c6592d1ff37d873991faccd1' 
  AND token = 'hERFs8jMAkG4NOcQ8ugH2bTfyNrahBH/vrTaSnTiFrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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