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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07de61420f5ea60ce59cb482cdd25b2fa09cf30128c73893a93a776c0aaf41c0' 
  AND token = '+bu9CoplqfG+N2uuvMCLVsgw0n7dmPXrDJ/E7UiN9r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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