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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676e0f17352542e8c2aa6ea0939389067052e4197800e138c069e765d4ab6718' 
  AND token = 'BWzjQkEbAzZGN2ekCGfFACR1qJbX1258U7kGGP2FPfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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